I'd run skinnier tires for sure. Has anyone that is scared of skinny tires actually tried it???
That said, CapriRacer says skinnier tires generally don't reduce rolling resistance. I think it's the kind of thing that varies on a case-by-case basis; I can't just say "skinny tires will reduce r.r." or "skinny tires will increase r.r." but in general my opinion is IF you are not loading the vehicle to it's capacity very often or not at all (like I do) a skinnier than stock tire could very likely help.
That size might be commonly available in Europe. I've not searched to confirm but I think Vekke has done some work in this area.
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